Comparison

CryptoDuck vs Greenbox Safe

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

CryptoDuck

Features
Read full description

CryptoDuck helps you and your friends create a secret language only insiders can read. Type a message, pick an encryption rule, and get ciphertext in one tap. Share it anywhere - only those who know the rule can decode it. Perfect for couples, close friends, and fun group chats. [Core Features] - Encrypt and decrypt text with custom rules - Build your own cipher: letters, numbers, emoji - mix freely - Rule management: create, edit, import, export, and share via Deep Link - Share as plain text, file, or beautiful ciphertext card (Pro: no watermark) - History: auto-save sessions with one-tap refill (Pro) - Rule Store: couple packs, emoji ciphers, gaming codes and more [System Extensions] - Home Screen Widget: see your active rule, jump straight to encrypt or decrypt - Shortcuts: encrypt or decrypt without opening the app, results copied to clipboard (Pro) - iCloud sync: keep rules across your devices (Pro) [Privacy First] - Plaintext, ciphertext, and rules stay on your device by default - No ads, no third-party analytics, no cross-app tracking - Optional iCloud sync is handled by Apple [Free vs Pro] Free: 3 manual rules, 12 total, 500 chars per encryption Pro: unlimited rules, no char limit, history, iCloud sync, watermark-free cards, Widget, Shortcuts and all paid rule packs [Important Notice] CryptoDuck uses custom character mapping - not AES or military-grade cryptography. Do not use for highly sensitive data. Ideal for fun secret messaging between people who share a rule. Download CryptoDuck and start your secret conversation. [Auto-Renewable Pro Subscription] 1. Subscription: Continuous (Monthly/Yearly) Pro Membership 2. Duration: One month or one year. Pro features are available during the active subscription period. 3. Price: Monthly and Yearly plans available (actual price shown on the App Store purchase sheet). 4. Payment: Charged to your Apple ID account upon confirmation of purchase. 5. Cancellation: To cancel auto-renewal, turn it off at least 24 hours before the current period ends in Settings > Apple ID > Subscriptions. Otherwise, the subscription renews automatically. 6. Renewal: Your Apple ID account will be charged within 24 hours before the period ends. Upon successful payment, the subscription extends for one more period (1 month or 1 year). 7. Privacy Policy: https://baitemi.com/jmy/privacy.html 8. Subscription Terms: https://baitemi.com/jmy/subscription.html

About

Greenbox Safe

Features
Read full description

Greenbox Safe is your personal encrypted vault β€” a secure place to store passwords, notes, documents, photos, IDs, and sensitive information without relying on any external server. Your data is fully encrypted on your device and only leaves your device in encrypted form. You can sync the encrypted vault file privately using iCloud or Google Drive, giving you complete control over your privacy. Key Features: β€’ Zero-knowledge architecture β€” only you can decrypt your vault β€’ Encrypted storage for passwords, notes, files, documents, and images β€’ Fast unlock using Face ID, Touch ID, or a master passcode β€’ Private offline mode β€” nothing is uploaded unless you choose β€’ Cloud Sync via iCloud or Google Drive (encrypted, zero-trust) β€’ No servers, no analytics, no tracking, no ads β€’ Import/Export vault files securely β€’ Designed for speed, simplicity, and total privacy Why Greenbox Safe? Most β€œpassword apps” and β€œvault apps” store your data on their servers. Greenbox Safe gives you real ownership β€” your encryption keys never leave your device, and only you hold the master key. Your data stays yours. Always.

Screenshots

CryptoDuck4 screens
Greenbox Safe3 screens

Verdict

The call

The clearest difference is update cadence: Greenbox Safe at every 3 weeks against CryptoDuck's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. CryptoDuck sells 6 in-app purchases, starting at $0.99 per month and Greenbox Safe sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

CryptoDuck ships an update every 3 months, Greenbox Safe every 3 weeks. Both last shipped on October 28, 2026.

Scorecard1 real difference Β· 5 level
CryptoDuck versus Greenbox Safe: the parameters behind the verdict, then further details
ParameterCryptoDuckGreenbox Safe
PriceFreeFree
Update frequencyEvery 3 monthsEvery 3 weeks β€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS16.015.6 β€” better
Further details β€” not scored
Size11 MB45 MB
Age rating4+4+
DeveloperBeijing Baitemi Technology Co., LtdDiscus IT

In-app purchases

6 purchases

CryptoDuck

Subscriptions2
  • Pro Monthly$0.991 Month
  • Pro Yearly$7.991 Year
One-time4
  • Couple Pack$0.99
  • Emoji Pack$0.99
  • Festival Pack$0.99
Show 1 more
  • Pro Lifetime$14.99
3 purchases

Greenbox Safe

Subscriptions2
  • Greenbox Premium (Monthly)$4.991 Month
  • Greenbox Premium (Yearly)$49.991 Year
One-time1
  • Greenbox Lifetime$199.99

Questions

Is CryptoDuck free?
CryptoDuck is free to download, with in-app purchases available.
Is Greenbox Safe free?
Greenbox Safe is free to download, with in-app purchases available.
Do CryptoDuck or Greenbox Safe have ads?
Neither CryptoDuck nor Greenbox Safe shows ads.
Which is updated more often, CryptoDuck or Greenbox Safe?
CryptoDuck ships an update every 3 months, and Greenbox Safe every 3 weeks. Most recently, CryptoDuck was updated on October 28, 2026 and Greenbox Safe on October 28, 2026.

Other comparisons